Scientists Propose Toilet Pellets to Conserve Water, Spark Debate

Scientists at the University of Surrey have proposed a novel method for water conservation: using perfumed pellets instead of flushing the toilet after urination. The study, which involved 20 UK households over a week, introduced "Wizso" pellets designed to dissolve in toilet water, tinting it blue and masking odors. These pellets aim to provide an alternative to the common "if it's yellow, let it mellow" approach, which some find unappealing.

The study revealed that participants were willing to forgo flushing, but primarily when they were alone or with close family. The presence of guests led to a return to traditional flushing habits, indicating that social expectations and the fear of embarrassment are significant hurdles. "We think that social expectations – the fear or stigma of what people might think of them if they were 'found out' not to flush – are a bigger problem than the habit of flushing itself," explained researcher Sophia Shaw-Brown. Participants living alone were more comfortable leaving the toilet unflushed.

The Wizso pellets, costing approximately £4.45 for a pack of 240, are dropped into the toilet after urination. They turn the water blue and release a lemon fragrance. Participants generally found the pellets easy to integrate into their routines, with some finding the blue color reassuring, associating it with cleaning agents. However, concerns arose when guests were present, and some women noted that the sight of menstrual blood automatically prompted them to flush.

Toilet flushing accounts for nearly a quarter of domestic water usage in the UK, with each flush consuming between four and 13 liters of drinking water. Professor Benjamin Gardner, a professor of psychology at the University of Surrey, suggested that the pellets offer a way to reduce flushing without relying on the less palatable "mellow" message. "Our study shows that these pellets can help us move away from the 'if it's yellow, let it mellow' message, which is off–putting for some, toward 'if it's blue, don't flush the loo'," he stated.

This initiative follows previous suggestions from the same research team, including a recommendation for Britons to install timers in their showers to encourage shorter bathing times. Co-author Sofie Voss, a PhD student at the University of Surrey, noted that real-time feedback from shower timers can interrupt autopilot behavior and raise awareness of time spent, prompting people to finish sooner.